I don't own a horse where I live since the board for one (even rough) is generally more than what people pay for their mortgage! Rough board at the barn I help out at (I know the owner) starts at $700 and goes up from there- no pasture boarding but they have turnout and there is no arena. That's a private barn and not a full facility (basically someone's backyard.)
My friend rides at a barn that is $915 a month for full board, grass turnout (instead of dirt which is cheaper and involves a smaller stall that isn't as nice,) and access to an indoor wash stall. If you want your horse to get hay at night you get charged extra; if your horse gets grain you get charged extra; if you don't take care of your horses on holidays you get charged extra; if you don't turn your own horses out on holidays you get charged extra. If they do anything with your tack or the horse that isn't included in boarding fees (exercising your horse, bathing/washing/tacking up, etc,) you get charged extra.
Lessons are not included- outside trainers come to the barn.
Some of the other facilities are $790 per month for full board unless you want turn out which is $60 more a month.
IF you are lucky you can get a very ROUGH turn-out in someone's backyard- no amenities, paying for your own food/shavings/hay/EVERYTHING else- is usually $400-500. A very small area if you are lucky and its not in a good area of Long Island will sometimes go for $200-300- but they generally involve driving for a few hours out to Eastern Suffolk where there aren't as many people, it isn't as developed, and involves at LEAST an hour or two worth of driving (each direction- total of 2-4 hrs driving to the barn daily) depending on how far out you go!
I'm on Long Island in NY.
Do what you feel in your heart to be right- for you'll be criticized anyway. You'll be ****ed if you do, and ****ed if you don't. - Eleanor Roosevelt